Electronics

Whole-House Surge Protector Cost-Benefit Calculator

Find expected savings from a whole-house surge protector based on home electronics value, surge frequency, and protection probability.

Inverter Surge Capacity Calculator

Size an off-grid or backup inverter from continuous load plus motor startup surge. Includes typical surge multipliers for fridges, pumps, and AC units.

Battery Pack Calculator — Series and Parallel Configurations

Calculate voltage, capacity (Ah/Wh), and cell count for any battery pack configuration. Design Li-ion, LiFePO4, or NiMH packs for EVs, solar, and DIY projects.

Decibel Calculator

Calculate decibels from power or voltage ratios, convert between dB scales, and understand sound pressure levels. Covers gain, loss, and SPL calculations.

LC Resonant Frequency Calculator

Calculate the resonant frequency of an LC circuit from inductance and capacitance values, or find L or C needed for a target frequency.

LED Current Limiting Resistor Calculator

Calculate the correct LED resistor from supply voltage and LED forward voltage. Returns the exact ohm value and nearest standard resistor size.

mAh to Wh Converter (Battery Capacity)

Convert battery capacity between milliamp-hours (mAh) and watt-hours (Wh). Calculate runtime, compare batteries, and understand power bank and device specs.

Projector Throw Distance Calculator

Calculate the ideal projector placement distance for any screen size, or find what screen size you'll get at a given distance. Works for any throw ratio.

Transformer Turns Ratio Calculator

Calculate transformer turns ratio, secondary voltage or current from primary values, and verify impedance transformation for audio and power applications.

LC Circuit Resonant Frequency Calculator

Calculate the resonant frequency of an LC circuit (inductor-capacitor tank circuit). Essential for radio tuning, filter design, and oscillator circuits.

Current Divider Calculator

Calculate how current splits between parallel resistors using the current divider rule. Find branch currents for 2 or 3 parallel resistors.

MOSFET Power Dissipation Calculator

Calculate MOSFET power loss from drain current, R_DS(on), switching frequency, and gate charge. Returns total dissipation and junction temperature rise.

Zener Diode Voltage Regulator Calculator

Calculate the series resistor value for a zener diode voltage regulator circuit from supply voltage, zener voltage, and load current.

555 Timer Astable Mode Calculator

Calculate frequency, duty cycle, and resistor/capacitor values for a 555 timer in astable (oscillator) mode. Ideal for electronics projects and prototyping.

Amplifier Gain Calculator

Calculate amplifier gain in decibels (dB) from voltage, current, or power ratios. Convert between dB and linear gain values.

Antenna Length Calculator

Calculate antenna lengths for dipole, quarter-wave, 5/8-wave, and Yagi designs from frequency. Covers HF, VHF, UHF, and WiFi in meters, feet, and inches.

Audio Crossover Frequency Calculator

Calculate crossover frequencies for passive and active speaker systems. Find capacitor and inductor values for 1st, 2nd, and 3rd order crossover networks.

Battery Series/Parallel Calculator

Calculate total voltage, amp-hours, and energy for batteries in series, parallel, or series-parallel. Covers 12V, 6V, and lithium battery pack configurations.

Bluetooth Range Estimator

Estimate the effective range of Bluetooth devices based on version, class, and environment. Plan your Bluetooth installations.

Cable Impedance Calculator

Calculate the characteristic impedance of coaxial and parallel cables. Enter conductor diameter, spacing, and dielectric constant to find impedance in ohms.

Capacitor Value Code Reader

Decode capacitor value codes (3-digit and color band) to get the capacitance in pF, nF, and µF. Also convert between units.

Coil Inductance Calculator

Calculate the inductance of a single-layer air-core coil from its dimensions. Uses Wheeler formula for solenoid inductance.

Decoupling Capacitor Calculator

Calculate the ideal decoupling capacitor value for filtering power supply noise at a given frequency. Essential for PCB design and electronics.

Ethernet Speed Calculator

Calculate file transfer time over Ethernet, required cable category, and real-world throughput for any network speed and file size.

Fan CFM Airflow Calculator

Calculate required fan CFM (cubic feet per minute) for rooms, server rooms, workshops, and electronic enclosures. Convert between CFM, CMH, and m³/min.

FPV Drone Motor KV Calculator

Find the right FPV drone motor KV rating from frame size, battery cell count, and flying style. Returns KV range for freestyle, racing, and cinematic builds.

Fuse Rating Calculator

Calculate the correct fuse rating for any electrical circuit. Find the right fuse size based on load current, voltage, and safety margin.

HDMI Cable Max Length Calculator

Find the maximum recommended HDMI cable length for your resolution and refresh rate. Avoid signal degradation at 4K, 8K, and high refresh rate displays.

Heat Sink Size Calculator

Calculate the required thermal resistance of a heat sink for any electronic component. Prevent overheating in your circuits and designs.

Motor Torque Calculator

Calculate motor torque in Nm and ft-lb, shaft power, and efficiency from voltage, current, and RPM. Covers DC, brushless, AC induction, and stepper motors.

Power Factor Calculator

Calculate power factor, real power (kW), reactive (kVAR), and apparent power (kVA) for single and three-phase AC circuits. Includes capacitor sizing.

PWM Duty Cycle Calculator

Calculate PWM duty cycle, frequency, period, on-time, and off-time. Essential for motor control, LED dimming, and power electronics.

Relay Coil Power Calculator

Calculate relay coil current, power consumption, and required driver transistor specifications from coil voltage and resistance.

Resistor Power Rating Calculator

Calculate power dissipation using P = V²/R, P = I²R, or P = VI. Returns watts and minimum power rating from 1/4W to 2W with 50% derating for safety.

Solar Charge Controller Size Calculator

Calculate the correct size solar charge controller for your solar panel array and battery bank. Supports PWM and MPPT controllers.

Speaker Impedance Matching Calculator

Calculate whether your speakers match your amplifier impedance. Find combined impedance for series and parallel speaker wiring.

Stepper Motor Step Angle Calculator

Calculate stepper motor step angle, steps per revolution, microstepping, and linear distance per step for CNC and robotics projects.

Transformer Winding Calculator

Calculate transformer winding turns, wire gauge, and core area. Design custom transformers for power supplies, audio, and isolation applications.

USB Power Delivery Calculator

Calculate USB power delivery wattage, charging time, and compatibility. Covers USB-A, USB-C, USB-PD, and Quick Charge standards with charging speed estimates.

Wire Voltage Drop Calculator

Calculate the voltage drop along any wire run. Enter wire gauge, length, current, and material to find voltage loss and check if wiring meets code.

Capacitor Energy Calculator

Calculate energy stored in a capacitor. Enter capacitance and voltage to find energy in joules, millijoules, and microjoules.

Impedance Calculator

Calculate AC circuit impedance from resistance, inductance, and capacitance. Shows impedance magnitude, phase angle, and reactance.

Ohm's Law Calculator

Calculate voltage (V=IR), current (I=V/R), resistance (R=V/I), and power (P=VI) with Ohm's Law. Enter any two electrical values to find the remaining two.

Cable Signal Loss Calculator

Calculate signal attenuation in dB per 100 ft for coaxial and Ethernet cables by type, length, and frequency. Covers RG6, RG59, Cat5e, and Cat6.

Capacitor Charge Time Calculator

Calculate capacitor charge time using the RC time constant τ = R × C. Returns voltage at any time step and time to reach 63%, 86%, 95%, and 99% full charge.

Capacitor Charge Time Calculator

Calculate capacitor charge and discharge times from resistance, capacitance, and supply voltage. Returns time constants, 5-tau charge time, and curve.

Device Battery Runtime Calculator

Calculate how long a battery will last in your device based on battery capacity and power consumption. Compare battery sizes.

Fuse Size Calculator

Calculate the correct fuse size for any electrical circuit based on wattage, voltage, and wire gauge. Prevent fires and damage.

LED Strip Length and Power Calculator

Calculate total LED strip length needed for a room and the power supply wattage required. Plan your LED lighting installation.

LED Strip Power Supply Calculator

Calculate power supply wattage and wire gauge for LED strip installations. Enter strip length, watts per meter, and voltage to size your PSU.

Power Bank Charge Calculator

Calculate how many charges a power bank provides for your phone, tablet, or earbuds from mAh capacity, device battery size, and 85-90% efficiency loss.

RC Time Constant Calculator

Calculate RC time constant (tau = R x C), charge/discharge time at 63% and 99%, and cutoff frequency for low-pass and high-pass RC filter design.

Surge Protector Joules Calculator

Calculate minimum joule rating for a surge protector from equipment type. Returns recommended rating from 400 to 4000 J for TVs, computers, and appliances.

Wire Ampacity Calculator

Find correct wire gauge in AWG or mm² from load current, run distance, and max voltage drop. Covers 12V, 24V, and 120/240V for home wiring, solar, and marine.

Home Network Speed Calculator

Find recommended home internet speed in Mbps from device count and usage types. Covers 4K streaming (25 Mbps), gaming (10 Mbps), and video calls (5 Mbps).

Monitor PPI Calculator

Calculate your monitor pixels per inch (PPI) from screen size and resolution. Find optimal viewing distance and compare to Retina display PPI standards.

Phone Charging Speed Calculator

Estimate phone charging time from battery capacity (mAh) and charger wattage. Compare 5W, 18W, 45W, and 65W speeds to see when you reach 50% and 80%.

PWM Duty Cycle Calculator

Calculate PWM duty cycle percentage and frequency from on-time and off-time. Essential for motor speed control, LED dimming, and switching power supplies.

Resistors in Series/Parallel Calculator

Calculate total resistance for up to 5 resistors in series or parallel. Returns equivalent resistance, current at a given voltage, and power dissipation.

RF Frequency to Wavelength Calculator

Convert radio frequency to wavelength for antenna design and RF engineering. Supports Hz through GHz with results in meters, centimeters, and millimeters.

TV Viewing Distance Calculator

Find optimal TV viewing distance from screen size and resolution. Returns minimum and ideal distance per THX and SMPTE standards — 65-inch 4K: 4 to 8 feet.

555 Timer Calculator

Calculate the frequency, period, and duty cycle of a 555 timer in astable mode from R1, R2, and capacitor values. Also covers monostable pulse timing.

Antenna Length Calculator

Calculate quarter-wave and half-wave antenna lengths from a given frequency. Supports output in meters, centimeters, feet, and inches.

Battery Life Calculator

Estimate battery runtime in hours from capacity in mAh and device draw in mA or watts. Applies efficiency derating and shows runtime at different usage levels.

Cable Voltage Drop Calculator

Calculate voltage drop in electrical cables based on length, current, and wire gauge. Get recommendations for meeting NEC and IEC standards.

Capacitor Charge Time Calculator

Calculate the RC time constant (τ = R × C) and voltage at each step during charging and discharging. Returns exponential formula and a charge curve chart.

Data Transfer Time Calculator

Calculate how long it takes to transfer a file over any connection speed. Enter file size and connection speed to get transfer time.

Ethernet Cable Length Calculator

Calculate how much ethernet cable you need including routing overhead for walls, ceilings, and slack. Avoid buying too little or too much.

Home Power Consumption Calculator

Calculate your home electricity usage and cost. Add appliances with their wattage and daily hours to estimate monthly kWh and electric bill.

Inductor Calculator

Calculate inductor reactance from inductance and frequency, or estimate inductance from coil dimensions. Essential for RF and circuit design.

PCB Trace Width Calculator

Calculate the recommended PCB trace width based on current, copper thickness, and acceptable temperature rise using IPC-2221.

Power Supply Calculator

Estimate your PC's total power draw by listing components and their wattage, then get a recommended PSU size with headroom.

Resistor Color Code Calculator

Decode resistor color bands to find resistance in ohms and tolerance. Supports 4-band and 5-band resistors with the full color table and E12/E24/E96 series.

Solar Battery Sizing Calculator

Calculate the battery bank capacity needed for your solar system. Enter daily energy usage, days of autonomy, and battery voltage for accurate Ah sizing.

Solar Panel ROI Calculator

Calculate your solar panel return on investment, payback period, and 25-year savings. Factor in system cost, monthly savings, and incentives.

Speaker Wire Gauge Calculator

Find the right speaker wire gauge based on speaker impedance, distance, and power. Avoid signal loss with the correct AWG wire size.

Transformer Calculator

Calculate transformer turns ratio, output current, and input current from voltage and power ratings. Essential for electrical design.

UPS Runtime Calculator

Estimate how long your UPS will keep your equipment running during a power outage. Enter UPS VA rating and total load watts.

Voltage Divider Calculator

Calculate voltage divider output using Vout = Vin × R2/(R1+R2) or find R2 for a target voltage. Used in microcontroller ADC, sensor, and bias circuits.

Wire Gauge Calculator

Calculate the recommended AWG wire gauge based on current, distance, and acceptable voltage drop. Supports feet and meters.